653 lines
16 KiB
C
653 lines
16 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1992 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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#ifndef lint
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static char rcsid[] = "$Id: fdisk.c,v 1.7 1994/10/20 00:06:17 mycroft Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/disklabel.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define LBUF 100
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static char lbuf[LBUF];
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/*
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* 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
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* Copyright (c) 1989 Robert. V. Baron
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* Created.
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*/
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char *disk = "/dev/rwd0d";
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struct disklabel disklabel; /* disk parameters */
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int cylinders, sectors, heads, cylindersectors, disksectors;
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struct mboot {
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unsigned char padding[2]; /* force the longs to be long alligned */
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unsigned char bootinst[DOSPARTOFF];
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struct dos_partition parts[4];
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unsigned short int signature;
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};
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struct mboot mboot;
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#define ACTIVE 0x80
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#define BOOT_MAGIC 0xAA55
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int dos_cylinders;
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int dos_heads;
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int dos_sectors;
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int dos_cylindersectors;
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#define DOSSECT(s,c) (((s) & 0x3f) | (((c) >> 2) & 0xc0))
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#define DOSCYL(c) ((c) & 0xff)
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int partition = -1;
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int a_flag; /* set active partition */
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int i_flag; /* replace partition data */
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int u_flag; /* update partition data */
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unsigned char bootcode[] = {
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0x33, 0xc0, 0xfa, 0x8e, 0xd0, 0xbc, 0x00, 0x7c, 0x8e, 0xc0, 0x8e, 0xd8, 0xfb, 0x8b, 0xf4, 0xbf,
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0x00, 0x06, 0xb9, 0x00, 0x02, 0xfc, 0xf3, 0xa4, 0xea, 0x1d, 0x06, 0x00, 0x00, 0xb0, 0x04, 0xbe,
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0xbe, 0x07, 0x80, 0x3c, 0x80, 0x74, 0x0c, 0x83, 0xc6, 0x10, 0xfe, 0xc8, 0x75, 0xf4, 0xbe, 0xbd,
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0x06, 0xeb, 0x43, 0x8b, 0xfe, 0x8b, 0x14, 0x8b, 0x4c, 0x02, 0x83, 0xc6, 0x10, 0xfe, 0xc8, 0x74,
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0x0a, 0x80, 0x3c, 0x80, 0x75, 0xf4, 0xbe, 0xbd, 0x06, 0xeb, 0x2b, 0xbd, 0x05, 0x00, 0xbb, 0x00,
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0x7c, 0xb8, 0x01, 0x02, 0xcd, 0x13, 0x73, 0x0c, 0x33, 0xc0, 0xcd, 0x13, 0x4d, 0x75, 0xef, 0xbe,
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0x9e, 0x06, 0xeb, 0x12, 0x81, 0x3e, 0xfe, 0x7d, 0x55, 0xaa, 0x75, 0x07, 0x8b, 0xf7, 0xea, 0x00,
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0x7c, 0x00, 0x00, 0xbe, 0x85, 0x06, 0x2e, 0xac, 0x0a, 0xc0, 0x74, 0x06, 0xb4, 0x0e, 0xcd, 0x10,
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0xeb, 0xf4, 0xfb, 0xeb, 0xfe,
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'M', 'i', 's', 's', 'i', 'n', 'g', ' ',
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'o', 'p', 'e', 'r', 'a', 't', 'i', 'n', 'g', ' ', 's', 'y', 's', 't', 'e', 'm', 0,
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'E', 'r', 'r', 'o', 'r', ' ', 'l', 'o', 'a', 'd', 'i', 'n', 'g', ' ',
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'o', 'p', 'e', 'r', 'a', 't', 'i', 'n', 'g', ' ', 's', 'y', 's', 't', 'e', 'm', 0,
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'I', 'n', 'v', 'a', 'l', 'i', 'd', ' ',
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'p', 'a', 'r', 't', 'i', 't', 'i', 'o', 'n', ' ', 't', 'a', 'b', 'l', 'e', 0,
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'A', 'u', 't', 'h', 'o', 'r', ' ', '-', ' ',
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'S', 'i', 'e', 'g', 'm', 'a', 'r', ' ', 'S', 'c', 'h', 'm', 'i', 'd', 't', 0,0,0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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struct part_type {
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int type;
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char *name;
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} part_types[] = {
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{0x00, "unused"},
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{0x01, "Primary DOS with 12 bit FAT"},
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{0x02, "XENIX / filesystem"},
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{0x03, "XENIX /usr filesystem"},
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{0x04, "Primary DOS with 16 bit FAT"},
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{0x05, "Extended DOS"},
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{0x06, "Primary 'big' DOS (> 32MB)"},
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{0x07, "OS/2 HPFS, QNX or Advanced UNIX"},
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{0x08, "AIX filesystem"},
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{0x09, "AIX boot partition or Coherent"},
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{0x0A, "OS/2 Boot Manager or OPUS"},
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{0x10, "OPUS"},
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{0x40, "VENIX 286"},
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{0x50, "DM"},
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{0x51, "DM"},
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{0x52, "CP/M or Microport SysV/AT"},
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{0x56, "GB"},
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{0x61, "Speed"},
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{0x63, "ISC UNIX, other System V/386, GNU HURD or Mach"},
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{0x64, "Novell Netware 2.xx"},
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{0x65, "Novell Netware 3.xx"},
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{0x75, "PCIX"},
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{0x80, "Minix 1.1 ... 1.4a"},
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{0x81, "Minix 1.4b ... 1.5.10"},
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{0x82, "Linux"},
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{0x93, "Amoeba filesystem"},
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{0x94, "Amoeba bad block table"},
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{0xA5, "NetBSD"},
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{0xB7, "BSDI BSD/386 filesystem"},
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{0xB8, "BSDI BSD/386 swap"},
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{0xDB, "Concurrent CPM or C.DOS or CTOS"},
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{0xE1, "Speed"},
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{0xE3, "Speed"},
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{0xE4, "Speed"},
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{0xF1, "Speed"},
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{0xF2, "DOS 3.3+ Secondary"},
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{0xF4, "Speed"},
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{0xFF, "BBT (Bad Blocks Table)"},
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};
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void usage __P((void));
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void print_s0 __P((int));
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void print_part __P((int));
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void init_sector0 __P((int));
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void change_part __P((int));
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void print_params __P((void));
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void change_active __P((int));
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void get_params_to_use __P((void));
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void dos __P((int, unsigned char *, unsigned char *, unsigned char *));
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int open_disk __P((int));
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int read_disk __P((int, void *));
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int write_disk __P((int, void *));
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int get_params __P((void));
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int read_s0 __P((void));
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int write_s0 __P((void));
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int yesno __P((char *));
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void decimal __P((char *, int *));
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int type_match __P((const void *, const void *));
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char *get_type __P((int));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int ch;
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int part;
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a_flag = i_flag = u_flag = 0;
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while ((ch = getopt(argc, argv, "0123aiu")) != -1)
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switch (ch) {
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case '0':
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partition = 0;
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break;
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case '1':
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partition = 1;
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break;
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case '2':
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partition = 2;
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break;
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case '3':
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partition = 3;
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break;
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case 'a':
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a_flag = 1;
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break;
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case 'i':
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i_flag = 1;
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case 'u':
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u_flag = 1;
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc > 0)
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disk = argv[0];
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if (open_disk(a_flag || i_flag || u_flag) < 0)
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exit(1);
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printf("******* Working on device %s *******\n", disk);
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if (u_flag)
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get_params_to_use();
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else
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print_params();
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if (read_s0())
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init_sector0(1);
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printf("Warning: BIOS sector numbering starts with sector 1\n");
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printf("Information from DOS bootblock is:\n");
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if (partition == -1) {
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for (part = 0; part < NDOSPART; part++)
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change_part(part);
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} else
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change_part(partition);
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if (u_flag || a_flag)
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change_active(partition);
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if (u_flag || a_flag) {
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printf("\nWe haven't changed the partition table yet. ");
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printf("This is your last chance.\n");
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print_s0(-1);
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if (yesno("Should we write new partition table?"))
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write_s0();
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}
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exit(0);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: fdisk [-aiu] [-0|-1|-2|-3] [device]\n");
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exit(1);
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}
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void
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print_s0(which)
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int which;
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{
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int part;
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print_params();
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printf("Information from DOS bootblock is:\n");
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if (which == -1) {
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for (part = 0; part < NDOSPART; part++)
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printf("%d: ", part), print_part(part);
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} else
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print_part(which);
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}
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static struct dos_partition mtpart = { 0 };
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void
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print_part(part)
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int part;
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{
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struct dos_partition *partp;
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partp = &mboot.parts[part];
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if (!memcmp(partp, &mtpart, sizeof(struct dos_partition))) {
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printf("<UNUSED>\n");
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return;
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}
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printf("sysid %d (%s)\n", partp->dp_typ, get_type(partp->dp_typ));
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printf(" start %d, size %d (%d MB), flag %x\n",
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partp->dp_start, partp->dp_size,
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partp->dp_size * 512 / (1024 * 1024), partp->dp_flag);
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printf("\tbeg: cylinder %4d, head %3d, sector %2d\n",
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DPCYL(partp->dp_scyl, partp->dp_ssect),
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partp->dp_shd, DPSECT(partp->dp_ssect));
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printf("\tend: cylinder %4d, head %3d, sector %2d\n",
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DPCYL(partp->dp_ecyl, partp->dp_esect),
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partp->dp_ehd, DPSECT(partp->dp_esect));
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}
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void
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init_sector0(start)
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int start;
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{
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struct dos_partition *partp;
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memcpy(mboot.bootinst, bootcode, sizeof(bootcode));
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mboot.signature = BOOT_MAGIC;
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partp = &mboot.parts[3];
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partp->dp_typ = DOSPTYP_386BSD;
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partp->dp_flag = ACTIVE;
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partp->dp_start = start;
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partp->dp_size = disksectors - start;
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dos(partp->dp_start,
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&partp->dp_scyl, &partp->dp_shd, &partp->dp_ssect);
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dos(partp->dp_start + partp->dp_size - 1,
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&partp->dp_ecyl, &partp->dp_ehd, &partp->dp_esect);
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}
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void
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change_part(part)
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int part;
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{
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struct dos_partition *partp;
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partp = &mboot.parts[part];
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printf("The data for partition %d is:\n", part);
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print_part(part);
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if (!u_flag || !yesno("Do you want to change it?"))
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return;
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if (i_flag) {
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memset(partp, 0, sizeof(*partp));
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if (part == 3) {
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init_sector0(1);
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printf("\nThe static data for the DOS partition 3 has been reinitialized to:\n");
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print_part(part);
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}
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}
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do {
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{
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int sysid, start, size;
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sysid = partp->dp_typ,
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start = partp->dp_start,
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size = partp->dp_size;
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decimal("sysid", &sysid);
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decimal("start", &start);
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decimal("size", &size);
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partp->dp_typ = sysid;
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partp->dp_start = start;
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partp->dp_size = size;
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}
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if (yesno("Explicitly specify beg/end address?")) {
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int tsector, tcylinder, thead;
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tcylinder = DPCYL(partp->dp_scyl, partp->dp_ssect);
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thead = partp->dp_shd;
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tsector = DPSECT(partp->dp_ssect);
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decimal("beginning cylinder", &tcylinder);
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decimal("beginning head", &thead);
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decimal("beginning sector", &tsector);
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partp->dp_scyl = DOSCYL(tcylinder);
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partp->dp_shd = thead;
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partp->dp_ssect = DOSSECT(tsector, tcylinder);
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tcylinder = DPCYL(partp->dp_ecyl, partp->dp_esect);
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thead = partp->dp_ehd;
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tsector = DPSECT(partp->dp_esect);
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decimal("ending cylinder", &tcylinder);
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decimal("ending head", &thead);
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decimal("ending sector", &tsector);
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partp->dp_ecyl = DOSCYL(tcylinder);
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partp->dp_ehd = thead;
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partp->dp_esect = DOSSECT(tsector, tcylinder);
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} else {
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dos(partp->dp_start,
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&partp->dp_scyl, &partp->dp_shd, &partp->dp_ssect);
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dos(partp->dp_start + partp->dp_size - 1,
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&partp->dp_ecyl, &partp->dp_ehd, &partp->dp_esect);
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}
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print_part(part);
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} while (!yesno("Is this entry okay?"));
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}
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void
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print_params()
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{
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printf("parameters extracted from in-core disklabel are:\n");
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printf("cylinders=%d heads=%d sectors/track=%d (%d sectors/cylinder)\n\n",
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cylinders, heads, sectors, cylindersectors);
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if (dos_sectors > 63 || dos_cylinders > 1023 || dos_heads > 255)
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printf("Figures below won't work with BIOS for partitions not in cylinder 1\n");
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printf("parameters to be used for BIOS calculations are:\n");
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printf("cylinders=%d heads=%d sectors/track=%d (%d sectors/cylinder)\n\n",
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dos_cylinders, dos_heads, dos_sectors, dos_cylindersectors);
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}
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void
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change_active(which)
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int which;
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{
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struct dos_partition *partp;
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int part;
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int active = 3;
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partp = &mboot.parts[0];
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if (a_flag && which != -1)
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active = which;
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else {
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for (part = 0; part < NDOSPART; part++)
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if (partp[part].dp_flag & ACTIVE)
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active = part;
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}
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if (yesno("Do you want to change the active partition?")) {
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do {
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decimal("active partition", &active);
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} while (!yesno("Are you happy with this choice?"));
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}
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for (part = 0; part < NDOSPART; part++)
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partp[part].dp_flag &= ~ACTIVE;
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partp[active].dp_flag |= ACTIVE;
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}
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void
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get_params_to_use()
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{
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print_params();
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if (yesno("Do you want to change our idea of what BIOS thinks?")) {
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do {
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decimal("BIOS's idea of #cylinders", &dos_cylinders);
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decimal("BIOS's idea of #heads", &dos_heads);
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decimal("BIOS's idea of #sectors", &dos_sectors);
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dos_cylindersectors = dos_heads * dos_sectors;
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print_params();
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} while (!yesno("Are you happy with this choice?"));
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}
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}
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/***********************************************\
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* Change real numbers into strange dos numbers *
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\***********************************************/
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void
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dos(sector, cylinderp, headp, sectorp)
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int sector;
|
||
unsigned char *cylinderp, *headp, *sectorp;
|
||
{
|
||
int cylinder, head;
|
||
|
||
cylinder = sector / dos_cylindersectors;
|
||
sector -= cylinder * dos_cylindersectors;
|
||
|
||
head = sector / dos_sectors;
|
||
sector -= head * dos_sectors;
|
||
|
||
*cylinderp = DOSCYL(cylinder);
|
||
*headp = head;
|
||
*sectorp = DOSSECT(sector + 1, cylinder);
|
||
}
|
||
|
||
int fd;
|
||
|
||
int
|
||
open_disk(u_flag)
|
||
int u_flag;
|
||
{
|
||
struct stat st;
|
||
|
||
if ((fd = open(disk, u_flag ? O_RDWR : O_RDONLY)) == -1) {
|
||
warn("%s", disk);
|
||
return (-1);
|
||
}
|
||
if (fstat(fd, &st) == -1) {
|
||
close(fd);
|
||
warn("%s", disk);
|
||
return (-1);
|
||
}
|
||
if (!S_ISCHR(st.st_mode) && !S_ISREG(st.st_mode)) {
|
||
close(fd);
|
||
warnx("%s is not a character device or regular file", disk);
|
||
return (-1);
|
||
}
|
||
if (get_params() == -1) {
|
||
close(fd);
|
||
return (-1);
|
||
}
|
||
return (0);
|
||
}
|
||
|
||
int
|
||
read_disk(sector, buf)
|
||
int sector;
|
||
void *buf;
|
||
{
|
||
|
||
if (lseek(fd, (off_t)(sector * 512), 0) == -1)
|
||
return (-1);
|
||
return (read(fd, buf, 512));
|
||
}
|
||
|
||
int
|
||
write_disk(sector, buf)
|
||
int sector;
|
||
void *buf;
|
||
{
|
||
|
||
if (lseek(fd, (off_t)(sector * 512), 0) == -1)
|
||
return (-1);
|
||
return (write(fd, buf, 512));
|
||
}
|
||
|
||
int
|
||
get_params()
|
||
{
|
||
|
||
if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) {
|
||
warn("DIOCGDINFO");
|
||
return (-1);
|
||
}
|
||
|
||
dos_cylinders = cylinders = disklabel.d_ncylinders;
|
||
dos_heads = heads = disklabel.d_ntracks;
|
||
dos_sectors = sectors = disklabel.d_nsectors;
|
||
dos_cylindersectors = cylindersectors = heads * sectors;
|
||
disksectors = cylinders * heads * sectors;
|
||
|
||
return (0);
|
||
}
|
||
|
||
int
|
||
read_s0()
|
||
{
|
||
|
||
if (read_disk(0, mboot.bootinst) == -1) {
|
||
warn("can't read fdisk partition table");
|
||
return (-1);
|
||
}
|
||
if (mboot.signature != BOOT_MAGIC) {
|
||
warn("invalid fdisk partition table found");
|
||
/* So should we initialize things? */
|
||
return (-1);
|
||
}
|
||
return (0);
|
||
}
|
||
|
||
int
|
||
write_s0()
|
||
{
|
||
int flag;
|
||
|
||
/*
|
||
* write enable label sector before write (if necessary),
|
||
* disable after writing.
|
||
* needed if the disklabel protected area also protects
|
||
* sector 0. (e.g. empty disk)
|
||
*/
|
||
flag = 1;
|
||
if (ioctl(fd, DIOCWLABEL, &flag) < 0)
|
||
warn("DIOCWLABEL");
|
||
if (write_disk(0, mboot.bootinst) == -1) {
|
||
warn("can't write fdisk partition table");
|
||
return -1;
|
||
}
|
||
flag = 0;
|
||
if (ioctl(fd, DIOCWLABEL, &flag) < 0)
|
||
warn("DIOCWLABEL");
|
||
}
|
||
|
||
int
|
||
yesno(str)
|
||
char *str;
|
||
{
|
||
int ch, first;
|
||
|
||
printf("%s [n] ", str);
|
||
|
||
first = ch = getchar();
|
||
while (ch != '\n' && ch != EOF)
|
||
ch = getchar();
|
||
return (first == 'y' || first == 'Y');
|
||
}
|
||
|
||
void
|
||
decimal(str, num)
|
||
char *str;
|
||
int *num;
|
||
{
|
||
int acc = 0, c;
|
||
char *cp;
|
||
|
||
for (;; printf("%s is not a valid decimal number.\n", lbuf)) {
|
||
printf("Supply a decimal value for \"%s\" [%d] ", str, *num);
|
||
|
||
fgets(lbuf, LBUF, stdin);
|
||
lbuf[strlen(lbuf)-1] = '\0';
|
||
cp = lbuf;
|
||
|
||
cp += strspn(cp, " \t");
|
||
if (*cp == '\0')
|
||
return;
|
||
|
||
if (!isdigit(*cp))
|
||
continue;
|
||
acc = strtol(lbuf, &cp, 10);
|
||
|
||
cp += strspn(cp, " \t");
|
||
if (*cp != '\0')
|
||
continue;
|
||
|
||
*num = acc;
|
||
return;
|
||
}
|
||
|
||
}
|
||
|
||
int
|
||
type_match(key, item)
|
||
const void *key, *item;
|
||
{
|
||
const int *typep = key;
|
||
const struct part_type *ptr = item;
|
||
|
||
if (*typep < ptr->type)
|
||
return (-1);
|
||
if (*typep > ptr->type)
|
||
return (1);
|
||
return (0);
|
||
}
|
||
|
||
char *
|
||
get_type(type)
|
||
int type;
|
||
{
|
||
struct part_type *ptr;
|
||
|
||
ptr = bsearch(&type, part_types,
|
||
sizeof(part_types) / sizeof(struct part_type),
|
||
sizeof(struct part_type), type_match);
|
||
if (ptr == 0)
|
||
return ("unknown");
|
||
else
|
||
return (ptr->name);
|
||
}
|